Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net Derivatives (2)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	$ 35	$ 36
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	0	(10)
Total realized/unrealized gains (losses) included in AOCI	(1)	4
Purchases (5)	0	0
Sales (5)	0	0
Issuances (5)	0	0
Settlements (5)	0	0
Transfers into Level 3 (6)	0	0
Transfers out of Level 3 (6)	(1)	0
Balance, end of period	33	30
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	(10)
Changes in unrealized gains (losses) included in OCI	(1)	4
Embedded Derivatives on Index-Linked Annuities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(3,932)	(6,641)
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	(1,090)	763
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases (5)	0	0
Sales (5)	0	0
Issuances (5)	0	0
Settlements (5)	(142)	204
Transfers into Level 3 (6)	0	0
Transfers out of Level 3 (6)	0	0
Balance, end of period	(5,164)	(5,674)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(1,166)	687
Changes in unrealized gains (losses) included in OCI	0	0
Corporate (1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1,787	1,399
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	1	0
Total realized/unrealized gains (losses) included in AOCI	24	(99)
Purchases (5)	142	422
Sales (5)	(13)	(93)
Issuances (5)	0	0
Settlements (5)	0	0
Transfers into Level 3 (6)	19	86
Transfers out of Level 3 (6)	(24)	(97)
Balance, end of period	1,936	1,618
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	1	0
Changes in unrealized gains (losses) included in OCI	23	(98)
Structured Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	365	220
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	(1)	0
Total realized/unrealized gains (losses) included in AOCI	1	(5)
Purchases (5)	19	87
Sales (5)	(4)	(2)
Issuances (5)	0	0
Settlements (5)	0	0
Transfers into Level 3 (6)	1	1
Transfers out of Level 3 (6)	(31)	(107)
Balance, end of period	350	194
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(1)	0
Changes in unrealized gains (losses) included in OCI	1	(5)
Foreign government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	38	26
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	0	0
Total realized/unrealized gains (losses) included in AOCI	1	(3)
Purchases (5)	0	0
Sales (5)	0	0
Issuances (5)	0	0
Settlements (5)	0	0
Transfers into Level 3 (6)	0	0
Transfers out of Level 3 (6)	0	0
Balance, end of period	39	23
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0
Changes in unrealized gains (losses) included in OCI	1	(3)
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	27	13
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	(2)	0
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases (5)	0	0
Sales (5)	0	0
Issuances (5)	0	0
Settlements (5)	0	0
Transfers into Level 3 (6)	0	0
Transfers out of Level 3 (6)	0	0
Balance, end of period	25	13
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(2)	0
Changes in unrealized gains (losses) included in OCI	0	0
Short-term Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	2
Total realized/unrealized gains (losses) included in net income (loss) (3) (4)	0	0
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases (5)	0	0
Sales (5)	0	(2)
Issuances (5)	0	0
Settlements (5)	0	0
Transfers into Level 3 (6)	0	0
Transfers out of Level 3 (6)	0	0
Balance, end of period	0	0
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0
Changes in unrealized gains (losses) included in OCI	$ 0	$ 0